Hi Luis,
I think what you are looking for has been published in a UK magazine called
Everyday Practical Electronics which features a lot of PIC designs. They
published a full article including PCB layouts and also you can send for a disc
of the software as well as buy the blank boards for a few UKP. It works out the
power consumed and will even tell you the cost of it.

There was some postings to the list from me and one or two others regarding this
around April this year. I've not got them anymore but have a look around in the
Piclist Archive. The magazine articles you need are in February and March 1996
issues.

PS Please dont be tempted by non isolated designs - you only got one life - at
least for now!

Regards
Bob Minchin
E-mail - bob.minchin@roke.uk